Base: Add manpages for cut, diff, head & rmdir command line utilities

Base/usr/share/man/man1/rmdir.md

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+## Name
+
+rmdir - remove empty directories
+
+## Synopsis
+
+```**sh
+$ rmdir `[directory...]` 
+```
+
+## Description
+
+Remove given `directory(ies)`, if they are empty
+
+## Arguments
+
+* `directory`: directory(ies) to remove
+
+## Examples
+
+```sh
+# Try to remove non-empty directory
+$ mkdir serenity ; echo cool > serenity/cool.txt
+$ rmdir serenity
+rmdir: Directory not empty
+
+# Remove empty directory
+$ mkdir example
+$ ls -a example
+.	..
+$ rmdir example
+$ ls -a example
+example: No such file or directory
+```